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perf(boot): defer schema and isogit construction until first use #4234

Job	Run time
session-store perf baseline	13s
test (2/4)	57s
static-analysis	41s
test (4/4)	1m 6s
test (3/4)	46s
test (1/4)	40s
build	10s
test (one-process pollution detector)	0s
typecheck	2s
eslint	3s
prettier	3s
build-and-test	4s
test (src)	3s
	4m 48s